2025/07/19 by Juliana Carneiro Gomes, Gomes, Juliana Resplande Sant'anna, Arlindo Rodrigues Galvão Filho +1
Computer Science · Mathematics · Social Sciences · #Artificial Intelligence (cs.AI) #Benford’s Law and Fraud Detection #Big Data and Digital Economy #Computation and Language (cs.CL) #FOS: Computer and information sciences #Information Retrieval (cs.IR) #Misinformation and Its Impacts
paper · doi:10.48550/arxiv.2508.06495
openalex publication_date 2025/07/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The accelerated dissemination of disinformation often outpaces the capacity for manual fact-checking, highlighting the urgent need for Semi-Automated Fact-Checking (SAFC) systems. Within the Portuguese language context, there is a noted scarcity of publicly available datasets that integrate external evidence, an essential component for developing robust AFC systems, as many existing resources focus solely on classification based on intrinsic text features. This dissertation addresses this gap by developing, applying, and analyzing a methodology to enrich Portuguese news corpora (Fake.Br, COVID19.BR, MuMiN-PT) with external evidence. The approach simulates a user's verification process, employing Large Language Models (LLMs, specifically Gemini 1.5 Flash) to extract the main claim from texts and search engine APIs (Google Search API, Google FactCheck Claims Search API) to retrieve relevant external documents (evidence). Additionally, a data validation and preprocessing framework, including near-duplicate detection, is introduced to enhance the quality of the base corpora.